This could come for almost free after SE-0143 is implemented: an Optional of a
Sequence could itself be made to conform to Sequence. It would cost no new
syntax.
extension Optional: Sequence where Wrapped: Sequence {
func makeIterator() -> AnyIterator<Wrapped.Iterator.Element> {
switch self {
case .some(let sequence):
return AnyIterator(sequence.makeIterator())
case .none:
return AnyIterator { nil }
}
}
}
This would be more easily done than new syntax, surely.
Cheers,
Guillaume Lessard
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